1 Definition
1.1 Definition
Adakite is an intermediate to felsic volcanic rock that has geochemical characteristics of magma which is said to be formed by partial melting of altered basalt that is subducted below volcanic arcs
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite
1.2 History
1.2.1 Origin
Adak, Aleutian Islands
Italy
1.2.2 Discoverer
Defant and Drummond
Unknown
1.3 Etymology
From Adak, Aleutian Islands
Comendite derives its name from the area of Le Commende on San Pietro Island in Italy
1.4 Class
Igneous Rocks
Igneous Rocks
1.4.1 Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
1.5 Family
1.5.1 Group
1.6 Other Categories
Fine Grained Rock, Medium Grained Rock, Opaque Rock
Medium Grained Rock, Opaque Rock
2 Texture
2.1 Texture
2.2 Color
Black, Brown, Light to Dark Grey
Blue, Bluish - Grey
2.3 Maintenance
2.4 Durability
2.4.2 Water Resistant
2.4.5 Scratch Resistant
2.4.7 Stain Resistant
2.4.9 Wind Resistant
2.4.10 Acid Resistant
2.5 Appearance
3 Uses
3.1 Architecture
3.1.1 Interior Uses
Decorative Aggregates, Floor Tiles, Homes, Hotels, Kitchens
Countertops, Decorative Aggregates, Interior Decoration
3.1.2 Exterior Uses
As Building Stone, As Facing Stone, Office Buildings
As Building Stone, As Facing Stone, Garden Decoration
3.1.3 Other Architectural Uses
3.2 Industry
3.2.1 Construction Industry
As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone
Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate, Landscaping, Making natural cement, Raw material for the manufacture of mortar
3.2.2 Medical Industry
Not Yet Used
Not Yet Used
3.3 Antiquity Uses
Monuments, Sculpture, Small Figurines
Artifacts
3.4 Other Uses
3.4.1 Commercial Uses
Commemorative Tablets, Pottery, Used in aquariums
Cemetery Markers
4 Types
4.1 Types
4.2 Features
Has High structural resistance against erosion and climate, Host rock for Diamond, Very fine grained rock
Very fine grained rock, It is One of the Oldest, Strongest and Hardest Rock
4.3 Archaeological Significance
4.3.1 Monuments
4.3.2 Famous Monuments
Data Not Available
Not Applicable
4.3.3 Sculpture
4.3.4 Famous Sculptures
Data Not Available
Not Applicable
4.3.5 Pictographs
4.3.6 Petroglyphs
4.3.7 Figurines
4.4 Fossils
5 Formation
5.1 Formation
Adakite rocks are formed when the hydrous fluids are released from minerals that break down in metamorphosed basalt, and rise into the mantle they initiate partial melting.
Comendite is a type of Igneous rock which is formed due to cooling and solidification of lava or magma. It may form with or without crystallization, either below the surface as intrusive rocks or on the surface as extrusive rocks.
5.2 Composition
5.2.1 Mineral Content
Olivine, Plagioclase, Pyroxene
Albite, Amphibole, Quartz
5.2.2 Compound Content
Aluminium Oxide, MgO, Silicon Dioxide
Al, Fe, Potassium Oxide
5.3 Transformation
5.3.1 Metamorphism
5.3.2 Types of Metamorphism
Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism
Cataclastic Metamorphism, Regional Metamorphism
5.3.3 Weathering
5.3.4 Types of Weathering
Chemical Weathering, Mechanical Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
5.3.5 Erosion
5.3.6 Types of Erosion
Coastal Erosion, Sea Erosion, Water Erosion
Coastal Erosion, Water Erosion
6 Properties
6.1 Physical Properties
6.1.1 Hardness
6.1.5 Grain Size
Fine to Medium Grained
Medium Grained
6.1.6 Fracture
6.1.7 Streak
Bluish Black
Bluish Black
6.1.8 Porosity
Less Porous
Highly Porous
6.1.9 Luster
Grainy, Pearly and Vitreous
Dull
6.1.10 Compressive Strength
6.1.13 Cleavage
Not Available
Not Available
6.1.14 Toughness
6.1.15 Specific Gravity
3.2.2 Transparency
3.2.4 Density
Not AvailableNot Available
0
1400
7.3 Thermal Properties
7.3.1 Specific Heat Capacity
7.4.8 Resistance
Heat Resistant, Pressure Resistant, Wear Resistant
Heat Resistant, Impact Resistant
8 Reserves
8.1 Deposits in Eastern Continents
8.1.1 Asia
8.1.2 Africa
Ethiopia, Somalia, South Africa
East Africa
8.1.3 Europe
8.1.4 Others
Not Yet Found
Not Yet Found
8.2 Deposits in Western Continents
8.2.1 North America
Canada, USA
Not Yet Found
8.2.2 South America
8.3 Deposits in Oceania Continent
8.3.1 Australia